4YV:
Five square mouth solenoid valve

4YA:
Five square pneumatic valve

400 Series Loop & position number:

10:single-head & two-position
20:two-head & two-position
30C:two-head & three-position close type
30E:two-head & three-position open type
30P:two-head & three-position pressure type

Adapter bore:
15:G1/2

Standard voltage:
DC12V
DC24V
AC24V 50/60Hz
AC110V 50/60Hz
AC220V 50/60Hz
AC380V 50/60Hz